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CONFIG_X86_X2APIC: Support x2apic

General informations

The Linux kernel configuration item CONFIG_X86_X2APIC:

Help text

This enables x2apic support on CPUs that have this feature.

This allows 32-bit apic IDs (so it can support very large systems), and accesses the local apic via MSRs not via mmio.

Some Intel systems circa 2022 and later are locked into x2APIC mode and can not fall back to the legacy APIC modes if SGX or TDX are enabled in the BIOS. They will boot with very reduced functionality without enabling this option.

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